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The latest ruleset for the Sisters of Battle is available in the Codex: Adepta Sororitas, which was published as an e-book.

Many units possess an ability called an Act of Faith. Once per game, a unit may employ this ability to grant herself and her comrades a particular buff for one turn, provided she passes a Leadership test.

The Sisters possess no psykers among their ranks, but they are allowed to use psyker auxiliaries.

The Sisters of Battle are not superhuman like Space Marines, but they do wear power armor and wield similar weaponry. They have a fondness for flame weapons, as they see great symbolism in "cleansing fire", which orientates them towards short-range combat. In the later releases a so-called Holy Trinity of bolter, flamer, and melta became a staple of their weaponry.[1]

In the 32nd millennium, the then head of the church, Goge Vandire, launched a coup d'état which plunged the Imperium into a terrible civil war. After the usurper was deposed, the Imperium decreed that the church could no longer maintain any "men at arms". A literal interpretation of the decree's wording left a loophole permitting an all-female force, even if it violated the spirit of the decree, so in the 36th millennium, the church established the Adepta Sororitas, owning to the need of the Inquisition to have its own force to stamp out heresy in its many varied forms within and outside the Imperium.

The Sisters are led by an Abbess and are organized into Orders. There are Six main Orders and a host of smaller orders. As the militant arm of the church, they are tasked with suppressing witchcraft and heresy, and guarding the Imperium's shrine worlds. They often work with the Inquisition, as their responsibilities overlap.

The design of the models themselves have a strong fire motif. They also take the Gothic appearance of the Imperium to the extreme: the Exorcist tank is shaped like a pipe-organ on treads. Forge World produces alternate versions of their tanks, which have a more "military" and less gothic look.